Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)	Jun. 30, 2023	Dec. 31, 2022
Assets [Abstract]
Cash and cash equivalents	$ 17,788,911	$ 27,612,732
Prepaid expenses	2,038,283	1,325,998
Total current assets	19,827,194	28,938,730
Property and equipment, net	224,080	234,912
Other assets	1,197,788	2,174,286
Total assets	21,249,062	31,347,928
Current liabilities:
Accounts payable	871,131	1,747,682
Accrued expenses	3,214,381	3,000,212
Total current liabilities	4,085,512	4,747,894
Equity [Abstract]
Authorized shares – 600,000,000 Issued and outstanding shares – 26,443,649 and 26,334,953 at March 31, 2023 and December 31, 2022, respectively	26,444	26,335
Additional paid-in capital	105,499,665	104,970,722
Accumulated deficit	(88,362,559)	(78,397,023)
Total stockholders’ equity	17,163,550	26,600,034
Total liabilities and stockholders’ equity	$ 21,249,062	$ 31,347,928